Novel substantially colorless dye precursors represented by the formula STR1 WHEREIN R1 is hydrogen or alkyl; R2, R3 and R5 is alkyl; R4 is alkyl or phenyl; Z, taken with N, represents the atoms necessary to make a benzthiazole radical; X is an acid anion; and n is 1 when R5 carries a negative charge and 2 when R5 is electrically neutral.
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(2008/06/13)
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